Sound reproducer



Jan. 13, 1931. I P. G. ANDRES SOUND REPRODUCER Filed Dec- 18, 1926 Inuemm'v fazed G. Mres, MEZYJZ/ML.

Patented Jan. 13, 1931 I N E STATESPATENT oF'FicE PAUL G. .ANDItES, or s'r. CHARLES, -I.LLINOIS, 'assienon, BY iv nsnn AssIeNmEiqrs-ro UNITED n'nrnomrcnas CORPORATION, or ST. CHARLES, ILLINOIS, A CORPORATION OF NEW JERSEYyGEORGE'CUGLEY AND LESTER E. NOBLE, RECEIVERS or SAID COR- P ORATION,

sooiv'n nriraonucnn Application flied December 1a, 1926. Serial No. 155,601.

The present invention relates to "sound reproducer's or regenerators and the like. Among the objects of the invention is to provide a novel sound reproducing or regenerating device capable of rendering or emitti ngfsound or sound Waves or llke Vibrations with purer tonal characteristics without loss of overtones and the like over the whole range of audible vibrations than here-'- tofore, andwith'substantially uniform amplitude and volume of vibration and sound throughout su'clr au'diblei'range, thus avoiding. the defectsof the volume and amplitude tapering off from the point of fundamental frequency or natural period and the tones being rendered flat or with blasting sounds or the like. T

To attain the encl'indic'ated, theinvention vibrator is" efficiently available for trans formation intosound vibrations without an absorption of part thereof in overcoming inertia or the like in'the parts tobe vibrated owingto. improper positioning or balancing thereof, or by reason of the weight of any of the part'ssuch as a vibratable diaphragm, disk or cone or the like. In ajspecific 1llus-' trati-ve embodiment the armature ofthe electromaghetic' generator is brought to I normally' medial position, when the generator is de'energized, by an adjusting means on the support ofthe device and connected to a vibratable cone armature.

Another object of the invention is to pro vide a free vibrating diaphragmatic mem her with its edge or base margin free so that the same may vibrate in unison with the remainder of the member without any impedance as would-be present if the margin or edgesporti'ons' were held or clamped to orbetweeni rings of a'support; Inthis way. all parts ofthe member are free to'emit the cone.

which is connected to the or initiate sound waves in substantially equal oruniform amplitude or volume.

- A further object is to provide the device with a vibratable element, such as a reed or the like made vibrant by connection to an armature of an electromagnetic regenerator, the element preferably having a characteristicnatural vibration and. also a' loop polnt, yet belng capable of transmitting all frequencies of vibration, throughout the audible range of frequencies, to the vi- .bratable member, such as the diaphragm or cone, as a load transmitting element. The vibratable member is preferably connected at a loop point of the reed. The natural periods of the cone and thereed are preferably remote so that when vibrations at or near the natural period of the-cone is being produced from the regenerator, the reedwill act as a load transmitter and the cone will act with efficiency by reason of the vibrations being at or near its characteristic frequency point, and when the vibrations are remote from the fundamental of the cone but proximate'to or at the fundamental of the reed, the latter-acts efliciently to impose. upon the diaphragrn full amplitude of vibration as if the vibrations being transmltted were at or near the fundamental of The reed also has the characteristic of transmitting overtones and the like so Other objects, features, capabilities [and advantages are comprehended by the inve'nthat the rendition of sound by the cone will ,be nearer to the'original tones than those heretofore possible.

tion aswill later appear andlare inherently possessed thereby.

Referring tothe' drawings, Fig'l'is aview, .partly in vertical section and partly inside elevation of an embodiment constructed in accordance with the invention.

Fig. 2 is a fragmentary front view of the same. i

Fig. 3 is afragmentary part sectional and part elevational View of a variation of justing means'usedin the saine,and

Fig. 4 is a "part horizontal sectional and i plan view of the feature shown in Fig. 3;

Referri g now more indetaii to the drawq poles 7 and S carrymg shoes 9 1 ann l0 sepone or more solenoids 11 having a ace 12 in which may be located a vior oscillatable armatur 1 3 any manner as upon or against fincrum points 11 d On the opposite side of the member 3 may be provided a'recess 15 forming shoulder 16 to which may be secured one end of a vibratable element 17 preferably in the form of a reed, as means of a suitable securing element 18. This preferably 9f non-magnetic material.

The other or free end 19 of this element preferably connected by a connecting rod or wire 20 which is also connected to an end 21 of the armature 13 whereby when the armature is vibrated the vibration is transmitted through the connecting element 20 to the free end of the element 17, the element 20 passing through a suitable aperture 22 provided in the plate at as clearly shown in Fig. 1 of the drawings.

The element 17 when vibrated will hate an independent vibration of its own and vibrate with greater e'lliciency and amplitude at a loop point thereof. At this loop point 23 is connected a rod or wire which or:- tends to and is secured to a vibratable member illustrated in the embodiment as in the form of a cone 25, the rod 24; being connect ed thereto by means of nuts or the like 26 and 27 and light weight aluminum washers 2-8 and 29 as clearly shown in Fig. 1 of the drawings. It is to be understood that any other mode of connection may be adopted without departing from the spirit of the invention, but that illustrated and described is illustrative. The base portion the cone is shown with a free edge or marginal part 30 which is out of engagement with any part of the support so that the edge portion will have a free vibration and move in unison with the remainder of the cone without impedance or hindrance.

If the vibratable member 25 were sup ported wholly by the rod 2 1 it will be apparent that the element 17 would swing to the side and hence also swing the armature 13 to one side and the actuation of the cone from the armature and to the element 17 would produce an incorrect emission or rendition of sound from the surface of the cone. In order to support the cone in proper position whereby the armature would be in neutral condition or in normally medial position within the solenoid, and yet be free to vibrate throughout the whole vibrating member including the marginal part 3 thereof, a supporting element 31 is secured as by a rivet or the like to a lower part of the marginal portion This element 31 is prefcrabl of thin metal and sulliciently stiff to support the cone in the vertical direction, yet very flo ible in a horizontal direction so that the vibration of the marginal portion 30 will not be hindered by this connecting element 31. The lower end of the element 31 may be provided with a head being preferably beveled and adapted to rest upon a supporting element adjustably secured to the support 1 by way of a bolt 35, the latter passing through an elongated slot 36 permitting the location of the bolt in any selected and vertically adjusted position within the slot. The top surface of the member 34 may be serrated or grooved whereby the head 33 may rest in any selected one of the grooves when adjusting the position of the vibrating member In this way the supporting means may be adjusted vertically along the support 1 or the cone adjusted laterally until the armature 13 is in mid position within the solenoid. If the armature be not in such position after vertical adjustment is made, the lower part of the cone 25 may be moved laterally until the armature is so positioned. The head 33 may then be rested in any selected one of the grooves 011 the member 34.

In Figs. 3 and 4 is shown another form of supporting and adjusting means comprising a permanent magnet 37 secured by a bolt 35 in the same manner as the element 3st is secured, so that the permanent magnet may be vertically adjusted to the desired height. The poles 38 and 39 are preferably spanned by the head or element 33 which is preferably of magnetic material and adapted to be held to the magnet at any position along the upper surface 40 thereof where the head 33 may have been moved. As the marginal portion 31 vibrates the element 31 will swing laterally therewith and the head 33 will rock as a fulcrum element upon the top surface 40 of the permanent magnet yet remain in place Without danger of sliding or moving, by reason of the magnetic attraction between the permanent magnet and the head 33.

While I have herein described and upon the drawings shown illustrative embodiments of the invention, it is to be understood that the invention is not limited thereto but comprehends other features, details, arrangements of parts and constructions without departing from the spirit thereof.

Having thus disclosed the invention, I claim: i r i A sound reproducing device, comprising a support, a vibratable diaphragmatic member, means on the support and connected to said member for vibrating said'member, said member having a free edge andbeing spaced from said support whereby the member may vibrate freely as a whole, a flexible supporting element connected to ,the lower edge of said member, a supporting part connected to said support and adapted to support said element in any selected position on said part.

In Witness whereof, I hereunto subscribe my name to this specification. I

- PAUL G; ANDRES; 

